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Just noticed that Beta 2181 has a screen refresh issue on XP 32 bit.
When moving the editor window across the screen, often the refresh does not happen fast enough and black rectangles are left on the screen where the editor had been. The rectangles are not necessarily the same size as the ST2 window.
Does not appear happen on Win 7 64bit.
Gone back to beta 2165 on XP for now.